A radial basis function algorithm for simplified fluid-structure data transfer

• Published in: International journal for numerical methods in engineering Vol. 99; no. 12; pp. 888 - 905
• Main Authors: Cordero-Gracia, M., Gómez, M., Valero, E.
• Format: Journal Article
• Language: English
• Published: Bognor Regis Blackwell Publishing Ltd 01.09.2014; Wiley Subscription Services, Inc
• Subjects: aero-elasticity; Aerodynamic loads; Aerodynamics; Aircraft; Algorithms; Finite element method; fluid-structure interpolation; Mathematical models; Radial basis function; radial basis functions; Three dimensional
• ISSN: 0029-5981; 1097-0207
• DOI: 10.1002/nme.4708

SUMMARYIn loosely‐coupled aeroelastic computation, the aerodynamic and elastomechanical models are based on different grids and eventually a simplified structural model, like a shell or stick, is considered. CFD tools are applied over the aerodynamic grid, whereas CSM tools are over the structural one. The meshes are usually non‐conforming; thus, three‐dimensional and non‐intrusive interpolation procedures are necessary to transfer structural deformations to the aerodynamic surface grid and aerodynamic loads to the structure. For that purpose, an interpolator based on radial basis functions has been developed. This tool does not require grid connectivities and can be applied to any three‐dimensional data.We have developed two strategies to deal with two special cases of interest. The first is when the structure is represented by a beam model and there is not a proper structural mesh close to the aerodynamic surface. The second is when managing a full configuration aircraft and the problem has been split into some small blocks in such a way that there are aerodynamic nodes belonging to more than one block. Copyright © 2014 John Wiley & Sons, Ltd.